TDA5230 Datasheet, PDF (92/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
Dual: AFSKFILBW1 & BFSKFILBW1: FSK Pre Filter Scaling
ADDR: 0x7C & 0x9C
Bit R/W Description
6:4 W FSKSCA: FSK Pre Filter Scaling
3:0 W FSKDEL: FSK Pre Filter Comb Delay Setting
use 1000b
Reset Value: 0x00
FSK Demodulator:
The FSK Demodulator is based on a delay and multiply principle (DAM). The required
settings are the DAM delay, the decimation factor (IDDEC) of the data filter and a final
scaling (ID scaling).
ID decimation:
IDDEC

=
round

¹⁶
*
R _FSKCIC
f _SYS
* R _Datafilter

*
f _Data


−1
IDDEC...Integrate and Dump decimation
RFSKCIC...Decimation Factor FSK CIC Filter(=FSKFILBW0+1)
RDatafilter...Decimation Factor Data filter(=DATFILT1+1)
f_Data...Datarate
ID scaling:
IDSCA = floor(log₂ (IDDEC +1))
IDSCA...Integrate and Dump scaling
IDDEC...Integrate and Dump decimation(=FSKDEMBW1)
The calculations above are fully automatically performed by the IAF TDA523x
Configuration Tool!
Data Sheet
88
Version 4.0, 2007-06-01